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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28d15e41ab25d660b77933b6cc4c66197da839de397aad88fd0d496d10841c4' 
  AND token = 'dKL/jlWDCw8pREoAF/BP0GHToyFUPp2NUDH0AcdcpBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}